Sheet-metal-cutter attachment for electric motors



Dec. 3, 1929. HEXDALL 1,737,884

SHEET METAL CUTTER ATTACHMENT FOR ELECTRIC MOTORS Filed Sept. 1, 1928 NVENTOR ATTORNEY Patented Dec. 3, 1929 UNITED STATES ANDREW HEXDALL, OF NIGERIS, ILLINOIS SHEET-METAL-CUTTER ATTACHMENTQFOR ELEC'JIRlG Ma a- I Application filed September This invention relates to a tin cutting attachment for electric motors and the like, the general object of the invention being to provide a curved knife which is adapted to be forced through the tin or other sheet metal to be cut and a reciprocatory member for forcing the tin against the edge of the knife, with means for reciprocating the member by a shaft provided with an eccentric and which is driven from the motor or other power means.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to

be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawing wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is an elevation of the device.

Figure 2 is a side or bottom View thereof.

Figure 3 is a side view of the knife.

Figure 4 is an edge View thereof.

Figure 5 is an edge view of the body of the device.

Figure 6 is an end view showing the eccentric on the shaft.

Figure 7 is a perspective view of the reciprocatory member and the parts associated therewith.

In these views, the numeral 1 indicates the body of the device which is of forked construction and which is formed with a centrally arranged bore 2 which rotatably supports the shaft 3, said shaft having an enlarged head 4 which carries an eccentrically arranged pin 5 on which is arranged a roller (3, it being seen that the head, with the parts thereon, are arranged between the prongs of the body.

A grooved block 7 is fastened to a shaft 8 which has its ends extending through holes in the prongs and a pin 9 is fastened to one end of the block and engages a hole in one of the prongs, said pin acting to prevent rocking movements of the block during its reciprocatory movement, which is transmitted thereto 1, i928. aar No: 303,431.

by the eceentrically arranged roller on the head of the shaft 3 fitting in the groove'of the block. A substantially triangular-shaped member 10'is fastened to the projecting end of the shaft 8 and a curved cutting blade 11 of substantially hook shape, formed with a U-shaped member 12 on its inner end, is fastened to'the outer wall of one of the prongs, with the member 10 passing between the space formed by the hook-shaped part of the blade so that this member 10 will act to force the metal being cut against the edge of the blade so that the metal will be cut and pushed outwardly, as shown indotted' lines in Figure 1, where A indicates the sheet being cut and A indicates the cut part ofthe sheet. a

The shaft-3 is adapted to be fastened in the end of auelectricmotoryas shown at 13 in Figure 1, or it may be fastenedto any 'other power device whereby the shaftwill be rotated from said device. x a

From the foregoing it will be seen that by pressing theknife through a sheet of tin or other metal and then starting the power device, the rotary movement of the shaft 3 will cause a reciprocatory. movement of the block 7 and the shaft 8 to which the member 10 is attached and thus this member will'force the metal against the edge of: the knife so that the metal will be cut. Bothv the member 10 and the edge of the blade 11" should be made of case-hardened steel.

The preferable Way of using the'device is to place the sheet of metal to b'e-cut'on'a support and to hold the device with the blade lowermost so that the block and the shaft 8 -will reciprocate in a vertical'plane. As will be seen, the curved edge of the member 10 acts with the cutting edge of the blade togive a shearing cut to the material'being operated upon. At the beginning of'the operation, an edge of the metal is placed on the blade in such a manner that said edge extends into the space formed by the hook shaped partiof the blade so that said edge is under the member 10. Thus'when said member moves downwardly, it will force the metal against the cutting edge of the blade and thus out the metal and push the cut portion in the position shown at A in Figure 1.

With this invention, it is possible to cut in any direction to a right angle direction to the right and in any direction to the left in the one operation without removing the device from the metal or suspending cutting operation, and that square corners can be cut with the machine without mutilating any part of the sheet metal.

I also prefer to make the cutting part of the blade 11 removable so that this part can be removed and sharpened or replaced by a new part when dulled. This removable part is shown at 11 and occupies a recessed part of the blade 11 and is fastened in place by a screw 11".

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts,

provided that such changesfall within thescope of the appended claims.

hat I claim is 1. A device of the class described com nrising a body, a reciprocatory member supported thereby, means for reciprocating the mom her, a cutting member on the end of the it, ciprocatory member and a curved. blade attached to the body and against the cutting edge of which vthe cutting member forces the material to be cut during the reeiprocatory movement of said cutting member, said blade extending substantially at right an gles to the line of movement of the reciprocating menr her and curving outwardly whereby a sheet of metal can be placed between the blade and the reciprocating member to cause said member to press the sheet against the blade to cut the same.

. 2. A device of the class described comprising a body of forked construction and having a centrally arranged bore therein, a shaft rotatably mounted in the bore, a pin eecen trically carried by the shaft and located be tween the prongs of the body, a second shaft passing through holes in the prongs, 'a grooved member attached to said second shaft, the groove of which receives the eccentric pin, a cutting: member on the outer end of the secondlshaft and a curved blade attached to one side of the body and having a hooked-shaped part forming a recess for reciving the cuttingmember whereby the material to be cut is forced against the cutting edge of they blade by the cutting: member during the reciprocatory movement of the parts.

In testimony whereof I alfix mv signature.

A. I-IEXDALL. 

